RV5C387A_03 Datasheet, PDF (3/49 Pages) RICOH electronics devices division – I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

RV5C387A
PIN DESCRIPTIONS
Pin No. Symbol
Item
2 SCL Serial Clock Line
Description
This pin is used to input shift clock pulses to synchronize data input/output to and
from the SDA pin with this clock. Allows a maximum input voltage of 5.5 volts
regardless of supply voltage.
This pin inputs and outputs written or read data in synchronization with shift clock
3 SDA Serial Data Line pulses from the SCL pin. Allows a maximum input voltage of 5.5 volts regardless
of supply voltage.
This pin outputs periodic interrupt pulses to the CPU. This pin is off when power
6 INTRA Interrupt Output A
is activated from 0V. This pin functions as an Nch open drain output.
This pin outputs alarm interrupt (ALARM_W) to the CPU. This pin is off when
7 INTRB Interrupt Output B
power is activated from 0V. This pin functions as an Nch open drain output.
This pin outputs alarm interrupt (ALARM_D) to the CPU. This pin is off when
4 INTRC Interrupt Output C
power is activated from 0V. This pin functions as an Nch open drain output.
The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled at power-on
1 32KOUT 32-kHz Clock Output from 0 volts. Nch. open drain output. The RV5C387A is designed to be disable 32-
kHz clock output in response to a command from the host computer.
9 OSCIN Oscillatory Circuit The OSCIN and OSCOUT pins are used to connect the 32.768-kHz crystal
8 OSCOUT Input/Output
oscillator (with all other oscillation circuit components built into the RV5C387A).
10 VDD Positive Power Supply Input
5
VSS Negative Power Supply Input ^{The VDD pin is connected to the power supply. The VSS pin is grounded.}
3